Hello Excellers, welcome back to another blog in the **#formulafriday** series. Today let’s look at how to combine conditional formatting with an Excel formula. What are we going to achieve with that?. Well, we can easily identify duplicate values using the combination of these features. So let’s take the problem that John has. He has two lists of guests to a retirement party. Another colleague of his has also been collating a list and John needs to identify duplicate names quickly and get one master list used for the party. He has the two lists List 1 and List 2.

So, the method John wants to use is to highlight visually any duplicate names on the two lists he and his colleague have. Of course with as little effort as possible. The results he wants to see are in the screenshot below.

### Conditional Formatting Basics.

Excel comes with a number of preset conditions that you can use to conditionally format your Excel cells. You can see the options some super quick options available by selecting the following options

**Home Tab| Conditional Formatting**

If you want to get a bit more flexible then select the following options

**Home Tab | Conditional** **Formatting | Create New Rule. **

The last option in the New Formatting Rule dialogue box is where we can get a bit more creative. Use your own custom formulas to create any number of conditional formatting rules. The Conditional Formatting must return a TRUE or FALSE or numerical equivalent. An example of some formulas that work perfectly with this type of formatting.

**=A2>50**

**=ISNUMBER**

**=ISODD**

When the formatting is applied to a range of cells, the key is to enter the formula cell references that begin with the first row and column (or the top left cell) in the range. The formula is then applied to each cell in the range respectively. Just think of how you normally create formulas and then copy the formula to the rest of the cells you want to. So, back to John’s issue today, how to write a conditional formatting formula to identify duplicated name entries in hi party lists

### Let’s Write Our Conditional Formatting Formula

John’s Solution is s simple one. We can use a formula to highlight any cells that contain duplicate data which returns TRUE if a cell value appears more than once.

- Select Home Tab | Conditional Formatting | Create New Rule
- In the Edit rule Description | Format where this formula value is true, type the following formula

**=COUNTIF($B$3:$D$14,B3)>1**

- Then select your formatting is the result if TRUE
- Hit Ok

It is important that the formula be entered relative to the “active cell” in the selection, which is assumed to be B3 in this case.

### How This Formula Works.

COUNTIF simply counts the number of times each value appears in the range. When the count is more than 1, the formula returns TRUE and triggers the rule.

When you use a formula to apply conditional formatting, the formula is evaluated relative to the active cell in the selection at the time the rule is created. In this case, the range we are using in COUNTIF is locked with an absolute address, but B4 is fully relative. So, the rule is evaluated for each cell in the range, with B3 changing and $B$3:$D$14 remaining unchanged.

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**How To Excel At Excel – Formula Friday Blog Posts.**

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